Elastic-fluid turbine



l). UNGGREN.

LSIC FLUID TURBINE.

:.Pvucmmu min 001.23* 1920.

l,378,464. Patented May 17, 192L Inventor". OscarJungcgVe-an l-liSAttomeg. y

FFICE.

OSCAR JUNGG-REN, OF SCHENECTADY, NEW YRK, ASSIGNOR TO GENERAL ELECTRIC CMPANY, A. CORPORATION F NEW YORK.

ELASTICI-FLUID TURBINE.

To all wiz-om. t may concern.:

Be it known that I. @SCAR JUNGGREN, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have inventedcertain nenv and useful Improvements in Elastic-Fluid Turbines, of which the following is a speci'- cation.

The present invention relates to elastic fluid turbines and particularly to rotor structures which comprise a ring o'f buckets fastened to a disk or drum at their inner ends and having their outer ends connected together by a sectional bucket cover. In

such structures each bucket cover section their natural period or due to inequalities,

of elastic iuid pressure'. Such vibrations may cause failure of buckets and the object of vmy present invention is. to provide an improved structure and arrangement for preventing their occurrence. Y

For a consideration of what I believe to be novel and my invention, attention is directed to the accompanying description andthe claims appended thereto.V Y Y In the drawing, Figure 1 is a side elevation partly in section of a part of a tur' bine rotor embodying my invention; Fig. 2

is a top plan view of several adjacent buckets; Fig. 3 is a perspective view of a tie plate; and Figs. 4, 5 and 6 are views similar to Figs. 1, 2 and 3 of another form of the invention.

Referring -to the drawing, 5 indicates a rot-or and 6 a ring of buckets fastened thereto at their bases and having their outer ends connected to ether by bucket cover sections 7, the uckets being provided with integral tenons 8 by means of which the bucket cover sections are fastened in posi tion. This divides the ring of buckets into groups, the buckets of each group having Specification of Letters Patent.

Patented May 17, 1921.

their outer ends fastened together by a bucket cover section. 1how, according' to my invention, I tie adjacent bucket groups together bv lmeans of flexible connections or tie plates such connectlons being located beneath the bucket cover 'so as not to be in a position Where they might fret worn oli.' or Where they will impair the clearances. In the arrangement shoivn in Figs. l, 2 and 3 the flexible connections are in the form of at plates 9 reversely bent to form a U-shaped part 10. In the plates are openings 11 through which the tenons on adjacent buckets pass. The flexible connections are thus riveted in place directly beneath the bucket,F cover sections by the same tenons which hold the bucket cover sections. ThisA arrangement is well adapted for use Where the outer ends of the buckets are comparatively close 'together'.

XVir-hen the outer ends of the buckets are some distance apart. I may use either the arrangement shown in Figs. 1, 2 and 3 or` I may use that shown in Figs. il, 5 and 6 wherein the flexible connections 12 are riveted directly. to the adjacent ends of the bucket cover sections by rivets as indicated at 13. 'In this case the flexible connection as shown in Fig. 6 has' its ends shaped' to conform to the contour of the adjacent bucket surfaces.

With either of the arrangements shown,

the connections While being flexible enough to lpermit of expansion and contraction` are sufficiently stiff to tie the' bucket groups togetherso as to prevent their vibration.

By arranging the yieldable connections directly beneath the bucket cover,- the periphery of the bucket ring may have the desired clearance with the turbine shell, the connections in n0 Way interfering as they would were they on the outside. Furthermore, there is no danger of the connections lubbing, thereby getting worn or coming oose. v

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and that the invention may be carried out by other means.

What I claim as new and desire te secure by Letters Patent of the nited States? is 1. In an elastic nid turbine, the combination with a ring of buckets, and a setional cover tying them together into groups, of means forming Hexible eonnecticns between adjacent groups, said means being located directly beneath the adjacent ends of bucketcover sections.

2. An elastic i'luid turbine having a. rotor with ak ring of buckets thereon termed inte groops by a sectional bucket cover characterized by the factl that the bucket groups thus formed are tied together by connections in the forni of plates located directif; beneath the adjacent ends o bucket cefer aangeeft sections and reversely bent to render them iexibie. Y

3. in elastic Huid turbine having a rotor with a ring of buckets thereon formed into groups by a, sectional bucket cover fastened inte place by tenons on the ends of the buckets, characterized by the fact that the bucket groups thus formed are tied together by flexible strips 'located beneath the adjacent ends of bucket cover sections and fastened by the tenons of the adjacent buciiets.

in Witness whereof, have hereunto set my hand tins 28th day of October, 1920.

OSCAR JUXGGREN. 

